Nagios is an open-source Monitoring & Observability solution from Nagios. Compare it against 4 other Monitoring & Observability tools on FreeSoftwareX — by features, licensing and price — and request a quote or demo free in 2026.
What is Nagios?
Nagios is open source — its source code is publicly available and free to use, modify and self-host, usually with an active community and no licensing fees. It is categorised under Monitoring & Observability and published by Nagios. Buyers typically evaluate Nagios when they need a dependable Monitoring & Observability option and want to weigh the trade-offs between free, open-source and paid tools before committing.
Yes. Nagios is open source and free to use, with no purchase cost for the core product.
What are the best Nagios alternatives?
Popular Monitoring & Observability alternatives to Nagios include Grafana, Prometheus, Uptime Kuma, Zabbix. See the full list of Monitoring & Observability on FreeSoftwareX.
